How do you spell years old in spanish?

Answer 1

For Example: The year 1989.

To write this in words, you would write:

Nineteen eighty nine.

Answer 2

'....an~os de edad', e.g.

20 years old = veinte an~os de edad

Answer 3

Years is the correct spelling.
An example sentence is "it has been several years since the last accident".